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If the circumference of a circle is 24 inches the radius is: 3.82 inches.
The circumference of a circle with a radius of 10 inches is about 62.83 inches.
1256 inches ++ Another Answer ++ The formula for finding the Circumference of a circle is C = Pi x D where D is Diameter and Pi is 3.1416. The Radius of a circle is one-half of the Diameter, hence the Diameter of a circle with a 20-inch Radius is 40 inches. Using the formula above, multiply 40 x 3.1416 to find the Circumference: 40 x 3.1416 = 125.664 inches.
A circle with a radius of 15 inches has a circumference of: 94.2 inches.
A circle with a circumference of 25 inches has a radius of about 3.979 inches.